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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Never, sentry.io is powered by a Python Django monolith (https://github.com/getsentry/sentry) and its doing just fine with scaling.
I can recommend the book series "You Don't Know JS": https://github.com/getify/You-Dont-Know-JS/blob/1st-ed/README.md
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